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相关概念视频

Voltage-gated Ion Channels01:26

Voltage-gated Ion Channels

8.3K
Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several...
8.3K
Regulation of Sodium and Potassium01:26

Regulation of Sodium and Potassium

630
The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily...
630
Neuron Structure01:30

Neuron Structure

13.2K
Neurons are the main type of cell in the nervous system that generate and transmit electrochemical signals. They primarily communicate with each other using neurotransmitters at specific junctions called synapses. Neurons come in many shapes that often relate to their function, but most share three main structures: an axon and dendrites that extend out from a cell body.
Structure and Function of Neurons
The neuronal cell body—the soma— houses the nucleus and organelles vital to...
13.2K
Roles of Electrolytes: Sodium and Potassium01:24

Roles of Electrolytes: Sodium and Potassium

524
Sodium plays a crucial role in maintaining fluid and electrolyte balance and overall bodily homeostasis. Sodium balance is primarily regulated by kidney function, which adjusts sodium elimination to match dietary intake and maintain proper electrolyte levels. Sodium is the most abundant cation in the extracellular fluid (ECF) and is found in salts such as sodium chloride (NaCl) and sodium bicarbonate (NaHCO3). Although cellular plasma membranes are relatively impermeable to sodium, its role in...
524
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.5K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.5K

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相关实验视频

Updated: Jul 28, 2025

Multi-photon Intracellular Sodium Imaging Combined with UV-mediated Focal Uncaging of Glutamate in CA1 Pyramidal Neurons
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Multi-photon Intracellular Sodium Imaging Combined with UV-mediated Focal Uncaging of Glutamate in CA1 Pyramidal Neurons

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Na 的结构绘图.

Qiurong Wu1, Jian Huang2, Xiao Fan3

  • 1Beijing Frontier Research Center for Biological Structures, Tsinghua-Peking Joint Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China.

Nature communications
|June 3, 2023
PubMed
概括
此摘要是机器生成的。

这项研究揭示了使用冷EM结构的电压关闭 (Nav) 通道上的新型药物结合部位. 了解这些结合模式可以促进治疗,疼痛和心律失常的药物开发.

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Mapping Inhibitory Neuronal Circuits by Laser Scanning Photostimulation
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Camera-based Measurements of Intracellular [Na+] in Murine Atrial Myocytes
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Camera-based Measurements of Intracellular [Na+] in Murine Atrial Myocytes

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相关实验视频

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Multi-photon Intracellular Sodium Imaging Combined with UV-mediated Focal Uncaging of Glutamate in CA1 Pyramidal Neurons

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Mapping Inhibitory Neuronal Circuits by Laser Scanning Photostimulation
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科学领域:

  • 生物物理学的生物物理.
  • 药理学 药理学是指药理学的学科.
  • 结构生物学 结构生物学

背景情况:

  • 电压导入 (Nav) 通道是神经和心脏疾病的关键药物标.
  • 许多Nav通道调制器的精确结合机制尚未完全理解.
  • 最近的结构研究提供了洞察力,但缺乏药物相互作用的全面地图.

研究的目的:

  • 阐明人类Nav1.7的高分辨率结构与各种药物和候选药物复合.
  • 在Nav通道中识别和描述新的药物结合点.
  • 为了解Nav通道调节器的药理学提供结构基础.

主要方法:

  • 使用高分辨率冷电子显微镜 (cryo-EM) 来确定结构.
  • 结构在2.63.2 Å时被解析为人类的Nav1.7复杂化与卡巴马泽,布皮瓦卡因,拉科萨米德,文波西丁,哈德维基基酸和维克索特里金.
  • 对现有结构数据进行了比较分析.

主要成果:

  • 在细胞内门下方 (BIG部位) 确定了一个结合部位,可容纳卡巴马西平,布皮瓦卡因和拉克萨米德.
  • 在选择性过器内发现了lacosamide的第二个结合部位,可以从中央腔中进入.
  • 维诺和哈德维基基酸与III-IV化结合,而维克索与毛孔域的IV-I化结合.

结论:

  • 该研究揭示了Nav1.7上多个不同的药物结合位点,包括细胞内,毛孔相关的化和选择性过器.
  • 这些发现提供了药物相互作用与Nav通道的详细3D结构图.
  • 鉴定到的结合部位为合理设计新的Nav通道向治疗方法提供了关键的见解.